I need to replicate the linux command “date +%s%3N” in SQL Developer. I have tried the below code sample but it returns with a different value. I have also done extensive searching Google with no luck. The date +%s%3N command returns something like: 1475615656692870653 Whereas the above code sampl…
Tag: time
How can GNU time utility ignores pipe symbol and takes all what left in command line as one execve argument?
Linux, if I run time tar -c stock_file | lz4 > stock_file.lz4, actually it makes something like time (tar -c stock_file | lz4 > stock_file.lz4), but if I write one little program: Then I build it to pretending_time and run it: Well well, the parameter is well not well | cat, then I have the check the so…
Measuring execution time with clock in sec in C not working
I’m trying to measure execution time in C using clock() under linux using the following: The output is: The documentation says to divide the clock time by CLOCKS_PER_SEC to get the execution time in sec, but this seems pretty incorrect for a 2sec sleep. What’s the problem? Answer Sleeping takes al…
linux c get system date format yyyymmdd
I want ask some questions 1) I want get string yyyymmdd of system date using linux c how should I do it ? And I want use this string do some arithmetic, like I have “20160317” I want do 20160317 – 90 get a new date,pls help 2) is there some cleaner way to do this? like if m =
Time multiple commands running in parallel in shell and save it in file
I have a bash script for which i want to know the time it took to run for individual commands and save them in a log file. Also I need some of these commands to run as a different process. The problem I am facing is I am not able to tell which output belongs to which command for example
Setting the right timezone, server and PHP
I need to set the right timezone. But I don’t understand if there is any difference between the PHP timezone (date_default_timezone_set()) and the Linux setting. Suppose I run a new AWS instance from N.Virginia. The default timezone of that server should be UTC-05:00 Does this mean that I have to set UT…
Running a shell script for a certain duration
I want to be able to run a script on Linux shell (bash) for a certain duration and sleep for a different duration. I’ve written something like the following snippet. However, I see only the sleep happening correctly but the execution stops after first execution. The response I get is ./script.sh: line 3…
How to convert timestamp from Hexadecimal format to EPOCH timestamp?
I am looking for a Linux command to convert hexadecimal time format to Linux timestamp. I have tried this command: But it seems to be wrong, the epoch output of 0xd6979880 should be 1391270400. Please correct me if I am wrong. Answer From your description (expecting 1391270400 instead of 3600259200), at appea…
What is the epoch of CLOCK_TAI?
Since Linux kernel version 3.10, the function clock_gettime() now accept CLOCK_TAI. I didn’t manage to find a detailed description of this clock. What is its epoch ? EDIT 1: Just compared the output of CLOCK_REALTIME and CLOCK_TAI on my Linux 3.19 OS and it returns the exact same value (1442582497) !? I…
change date/time using python in linux
I tried using date command to change the system time in debian linux: os.system(“echo passwd | “sudo date -s “Thu Aug 9 21:31:26 UTC 2012”) and I set the python file permission to 777 and also chown as root. But it does not work and says date: cannot set date: Operation not permitted. …